“Well, we were just about to send out Save the Dates for our wedding in May when we got this little surprise,” the 34-year-old musician shared on Instagram alongside a sweet ultrasound video of their unborn child.

“Baby Carney is happening this summer and Patrick and I couldn’t be more excited!” she added.

“Thank you for all the birthday love and wishes. Last night, right before I blew out my candles, Patrick asked me to marry him and then I had nothing left to wish for … 34 might be the best year yet,” Branch captioned a photo of her Art Deco engagement ring and her birthday cake.

The couple met in February 2015 at a Grammys party in Los Angeles. They soon began writing and recording together — they co-produced her latest album, Hopeless Romantic — and fell in love along the way.

In April, Branch told PEOPLE her relationship with Carney and their family dynamic was a lot “like Modern Family.” She and daughter Owen moved in with Carney in Nashville.